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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754c76d4df0f646b8d6649dc7191ba44961c123cf656b5619f5d48edc84028de' 
  AND token = '77RYOLxiW9OLHzOeWdjb+OUHg1yaHKx1nf0e82wQLm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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