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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8528b54689afb5196de453d72eeca988c4aa858d0a5be2ed579e47e6c7890f24' 
  AND token = 'l73By7ggViewz5zys5eRiiFT6k0LwbF9lkuOWc7tAHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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