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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd7006020f2f6fe8623e22abbed64cfc454012ea01748a0c0af697d05da60f0' 
  AND token = 'PMBt2MYiGadUTJVh9zX4PszT0kvrP9m5Q5tteDkFHfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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