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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e20304a9e66377c5c8910039ad9143849c56aefbb031b9e4a8f91303dd224b0' 
  AND token = 'SqjC5VgjQwFjoWQe/FgXOPGc5CgWkMhjMvw0loG9rkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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