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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13108843843b398461e1d5f0d979ffcfb2899e7f7ecf60eb6847d2ff82cbdb6' 
  AND token = 'HMiItwPWpDw7TZZXDK9WUABbTu3AoZXW2LcESW2hWck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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