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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac70e343a2452f78450410d1111f56bf0ebe833276e84a490f7b4abca53417df' 
  AND token = 'gP4ldl0KIwqQSDUDpZ1wVrKgOivOuLUNHwkB9ig0iuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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