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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f01fd78a12a6b70d90973cd516e949bcc51c1dc2862d6c059005f210399569' 
  AND token = 'Wq5Y7Cqu8nHc0EnZJf2A/vu4ECZ9u9a10s7aWovEy4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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