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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcb5b43dcea4b70cd79d3deb67e03a45923c5c9b09cab707c5871f962b7c5e4' 
  AND token = '/Hlcd0UkVGkfUNAEUm89p3n1EgWf72dEEUhIb6qZofc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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