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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23b62f2d11e59d8fc54b3d085ebf37335e82507c763f427b85290d7ee6bfef5' 
  AND token = 'l0HZeKH1bIN0Sy3AKtn00c70JrfIOsBcQYgOcuufveU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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