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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3531b894c9b4e3047f28fc1d287a5f335d1ca5605e177e321526b5ed41f575' 
  AND token = 'c53CN5xrljO5pMHvqCIWGQzyR+4gFWb4qRInjSK0wb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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