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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc0352a2b14d600ed075b376090bb7c19a9edd7b08a8127a12185bea10fa343' 
  AND token = 'f9uABIqrmiZgkV7umM2Q+IiCZWP246YSoigWLQhBCK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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