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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82ba3d20d8c578bf6e2372be5524ef5bb8d449322279a5be78d857ce39cc121' 
  AND token = '1w3TuDvDl5ytAyJ7eXe21l37la8kbNZBRveb6hkZOc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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