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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212fe093b10fe4194141e93f1d4a4b1107b124830b7f5686001d07c249c19c33' 
  AND token = 'JhDo/eeVbSjJpwz89Jx1/4n61ijHHyQYWx/XKiy19gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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