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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150befb646c641b192d996da282e9e91e5da462b3470a042a5cb4e632fdc51ee' 
  AND token = 'r4qU+cUfM9s+P/qWzXdQOwrfS7Um8h8uFy7hzORZWos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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