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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ba94a8ab496f186c4ff8fb77a6e395b034f3271997ea1b4bd00bf03b730f5d' 
  AND token = 'Xi9wLKAcOVu88Gkh1NZthS9N+1jPU+6ombRejj4zPGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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