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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bfc31d7f3a84165288d4a21f2518d60cd1cfe57261025f88b4cdd9828551cd' 
  AND token = 'beniPQoOSzdpbO8jQ8DeBL/KsvCkG4HaGvF/PPRXcio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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