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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392beb2dd3301e9ca7b719d9e230fc911547c5313212dd026a18197c17cb562e' 
  AND token = '+zHfqu3oU71pNHtYdzDYla3BWY+nYyRydmzbb+h6aUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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