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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c1214d5881a7407a402b6216fb4b0e8ed580ccdf8641445e988f64582c602f' 
  AND token = 'mwQ612esHAw+202S2PTygc3ueKY9jPLI/v75rntIUJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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