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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86da70c380af1f3780299b8bf454733c07341b5ee4febeeb136fbd9ca6ed5061' 
  AND token = 'S2+sCjNQzwmNp2EQII+sJNQRFD4Sk3Hvs2MwglSfDB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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