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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c55588222e8fdb4b8ff954a315a65192a3169128bd43de53b69c993e77a8c3' 
  AND token = 'af3YC4N/fJTk4pvXlkH+PYP4THIHmzEc+gQUyR83ch8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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