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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c7548e1af9be120541de10c0b062cbf9c8a02524b563336d654fa0d8a8fe51' 
  AND token = 'IyniW/pUCWOyDc/jPvTRPE80pJess2MpAfxjcChf7AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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