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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1570f2cae90bf2e230384a685b5c5c45f1d6bbde8527ac14fae511222cdeac2' 
  AND token = 'gi7ZIp40BVocYd8V1LE2fGY0YR3NkQGijPNzLSm/1yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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