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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e11c4c56ca0070960d53c9191c040aeeaad76e9aaaab37eab5871c855a52121' 
  AND token = 'Z4XmK2yrmKF0P4x1RIrw8ScSlbjk4f+5rQ+a+bTDT9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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