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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbb7a272352883e0fca095b2a3a43ad9e0d4a59fc65a0900f3d0533946205cd' 
  AND token = 'OvbtXqkbu0XqgYapOHDOJrvTB891zGUJF9dQ/QY2QZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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