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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd4b6784fa33e6176425d0fa35b3d02374d45e3e3b7a8e9b965f401002111d3' 
  AND token = 'BwYVK8ADrWLYRKWJVOL2ov2oif4R74+4afuIZFwJATY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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