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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4caf955f3c734201b4ccab5a752136d4a40caacf5d20cb7ed732748ee31c564' 
  AND token = 'NmTQLWqzjsGg+eFUhsuQonkcsAcZ6sKFECj2gZL7ycY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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