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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bbee107b4597d90c8bd4496f5c2c8b96723776ffe787a8237952368ca38552' 
  AND token = 'bgSexV7EyN9u8wZ+tUKy8MXr20jaWT3HX0aYdL7sIBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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