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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79877fb276d8e9fe036e2cc2091053557006662b9cc72842dd0ebd52dc15d92' 
  AND token = 'DYxs7hLv2HtDzuA2DeAJ3oJb4Lm0RtI2JyEa8GFl5+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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