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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0943c8f88b72b60781997bc397455f1ddc9d5560d84945577341e7b98131ff5e' 
  AND token = 'UPvM/DoPry2BvNc+yIzXleMmNY7RiOuzmf0ngGLb55U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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