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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cb7c9c3da97b8a0376908b9cfe176c0a8d49c5f4ec1f42242f6f11104d7e72' 
  AND token = '+l451vbD51G4bpnqxzdgVYnZhvvcbobeR0FO3V5Fp8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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