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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e9ac88e5207e5d1793f6f250185b863da3f59ec40a0cae0fc8e99c6f1f7f87' 
  AND token = '9WtMsV+N9ipeYW/oa72hMB2K/1atdAnCZp5rOToIrvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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