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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7afc5c842340d85b00c654c478f157aaa0c693b968fa9ccf3f011abc85fd585' 
  AND token = '+OEVhJyHkioFP3hbWxcG0ETEO71hd2+51L0mnp44GM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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