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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac16c08fd5dc82b0a07e060ef05216a468a4e914d6980acf9eb5f9bce0cda65' 
  AND token = 'Y4dHy3Ra379FS8w8v7UZovpR63SX+9i9YBz59RYGbis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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