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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d2e48f820c3b178295c1ff75c223ac157f1b1caa166f0f2aef4805050d8f5b' 
  AND token = 'l19lndU/oe7iObzE/fXZkaJEdReofT1iN425I4NCvHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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