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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d3c493816e2f4f22c1691dcdc1538745496f61b9a50d37c57b56e5ccf1aeba' 
  AND token = 'zDBc5xHI2MOj9KNx54vm3ug1NQyIMycJC+s7Sbo9jj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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