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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22cf71bbd1e1e106a140f6052b986d973c2513f31a7864cdab137ac4eb275b59' 
  AND token = 'XA69C2NxNamxVd/fEZxWp4CieBY/EWGlSY2mSRvF+so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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