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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9edb2ddd44c8e4e1601fcce166c3287866f2d9e194e5f85509a92894908d7a' 
  AND token = 'FKVzdo1jP5Y7tjaxSilksexC6fkNLINhhnnx38id0eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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