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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b12ddacd07634b046f631fd27415d2e374e3c26367a7a87e4a5a45abf85417e' 
  AND token = 'FkoDo2+QfIZGT+HB3lMV8flHy6xkjvcNpttJdCAWcmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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