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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4e7ceca5814240c2e3fc4e99836a198738ce562f8fcbd1a90c5c6c36bf332f' 
  AND token = 'kKofcmeq4HyaPJD6ykUaBdCzFazpyi5NRD5sw7qGTyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}