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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e88c37c7a4581056b0375b0a93b8dde191d1fe7b3d640ee4eefb593b2e3876' 
  AND token = 'OcA0yJoviO5Q+ynrC6wp96kXQ9/w7jVzyhqaC8Z0Vw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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