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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c205c028be99890bb9d10e074942ffcde8672b9b2fb4c8c99a520a33f3b72c7' 
  AND token = 'wICrPqbSl1myTRdXR6Qc3+VjMHFjNQl+6t5pkN6aLWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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