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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70b098a063888fdd02a1a5df309f5447fccb34f278093127fb209a507abcc98' 
  AND token = 'cC0fVTKiUk1OfooS6rYdScR5OA+ZLJC/iOndo92ccBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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