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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db4505793068c136f39503e1558b56adc5a7d0fd3d5c8fd3296b22723d53b5c' 
  AND token = 'QNFaXwZA9WXgL3KywSstOyvT9Kqg5HMIe084hgMLGls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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