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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7858bbdfb495a863e200f86f81b90c974dae42693158d06340f10cedcf6c370' 
  AND token = '01mAsyU+HYInVE31a7g5bxhVvFxc8K/Dk4AV/k3OMqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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