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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8eafcc684aa996cd2c2e5630cbeed60acb174bf932c176e3d8520486167040c' 
  AND token = 'Kx+4E8NMheYGmvTztp14vw5E4B6ZIJcSsaoqAmblQ/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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