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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37968c2399f134f5f0191269b84fdc632d8033a5582f631a1817d76b5cd3146' 
  AND token = '03wyFwjyZNlzYUF1sB9OfEk/TdE5+S0hrptkhLOt9z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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