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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a617439c5545d6ad406735abffe7cba1bfbffb6d57c813268486f39ddd14d64d' 
  AND token = 'behIRz84NgE5k8vco70If8uuMlzX5YIGwX0Rxhf6FG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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