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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d190732f98a011e48d19f7ff2bff3593572b8b41a85ded09adc15aaeb1d002e' 
  AND token = '1fdCazZ8CM824Z42hHYtEyrDJxqkmevK3MNDZz8f3kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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