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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfbf3c2d27de8f895acc0a22b0a25d8d2e41c2c93453fc3bdb1b43b434f8169' 
  AND token = 'biPVkc49HJ3tHc2rsJKZ6blAIngbVsnbNw9bSe6JJGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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