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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa352045c3b0009be57c6c0767148d94d3ae6ebe762070b0876df5ff5c879541' 
  AND token = 'zykY/yMArzoVfC+R9U4iibBeVFS7ncLJHZVl8OOS3h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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