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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae888b9ed9f7aa8c477ba7bbde9ace30fa1561a2c2fa27ee4bac3ed15fbf918' 
  AND token = 'sTMf/wE3+ADa0jRb7BeItMMN29fGhjmR51sPK3kkztA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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