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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc63375769fb03cd36e22d1452399c822985ef569cadde5094e49a493f7cae4c' 
  AND token = 'R6NfIDKTIkyCATIuN9l2aWSydn+c/m8QTJvMUguHi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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