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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fec4d5265041b5f47abb1113b1c7643809cae1baf674adb9c1800019b570ff' 
  AND token = 'jT2W7iqnLZt0WRSSB38wsgfuNoDNAwQMonwpInF/doQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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