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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4589f130c395e168d7a4dc4019125bc75083143b86f1377cf68a4111b0ec36f1' 
  AND token = 'WoKpa/4hh4WLvS9oJ8V9vUl265GVzspmxI0QidUCpJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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