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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ebfa05a7519c96ec5046a23286596f931a6559fbc334d68144f1eb925ce6c2' 
  AND token = 'yz7iiNm37bFtYudazFRnSzDxwNIp+y6KlIetQGHS23w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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