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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf7a5e8ecffe393fbbfe8026b25d273c728b5704abe16145693cc2291b612fa' 
  AND token = 'dsBerpYcaYCNcTASK56mmV6vEsCOTFuJDwE3r3WoVUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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